I have realized that the the weakest link of my current set up is in the CD player. To enhance the sound, I was recommended to use the WESTERN ELECTRIC ST-111 audio coil which can enhance the sound by making the sound warmer and creating a better large field sound.
Since my CD player is the weakest link, I was told that it is best using it for CD to Preamp as it will help to enhance the sound of CD toward the LP sound.
Long known for their superb sonic integrity and ample headroom capacity, the Western Electric 111C still can outperform most, if not all, the audio transformers of its type made today. There are not many remaining on active duty around the US at radio stations. The changeover to dedicated digital audio telephone circuits over fiber as well as ISDN lines for special “remote” broadcasts has removed the need for these coils.
The 111C is a toroidal type repeating coil was designed for dependable impedance matching applications and for line isolation at circuit transfer points. It is intended for use with amplifiers for program transmission over long or short cable or open wire circuits equipped with proper loading. It was the Bell System standard coil for broadcast radio lines for 50 years.
The factory specifications call for a frequency range of 30 to 15,000 Hz. with an insertion loss of less than 0.5 dB. The maximum power capacity at 30 Hz is 1.1 watts (+30dBm).
In actuality, the Western Electric specifications are quite conservative. Using a Hewlett-Packard 3551A Transmission Test Set on 6/1/2007, the actual measurements are a bit better. Overall loss is 0.4 dB at 1,000 Hz. The frequency response is +0, –0.2dB 28 to 20 kHz referenced to 1,000 Hz. The oscillator in the test set does not go below 28 Hz. The high end was down 0.3 dB at 24,000 Hz. At the upper limit of the test set, the response was down 2.0 dB at 65 kHz.
Input impedance is 600/150 ohms. Output impedance is 600/150 ohms.
Each unit weighs 4.5 lbs. It measures 2-9/16 inches x 4-3/16 inches x 4-17/32 inches. These units are ideal for eliminating ground loops and other electromagnetic hash. They have an inter-winding electrostatic shield that can be connected to the audio ground
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2 comments:
Hi Francis,
I have read your experiments with the Western Electric 111C and I would like to know how did it go putting the WE 111C between CD and PRE?
I have bought a pair of these respected transformers and Im planning to do the same as you. I dont know if you are aware but Western Electric used to sell a pair of 111Cs in a box labeled as "Western Electric 111C CD Processor" you can see it here,
http://www.westernlabo.com/45_625.html
If you check the pictures, you can see they use 2 resistors and one capacitor per channel. Actually, the capacitor looks like an Auricap.
How did you connect your transformer? Did you use resistors and capacitors?
Thanks
Alan Brain
Hi,
Sorry to necro this, but that "Western Electric 111C CD Processor" was never built by Western Electric. The 111C transformer was probably discontinued before the majority of CD players were built. This processor was built by an independent party using real 111Cs with a facsimile of the WE logo...
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